How To Fix a Mac Or MacBook That Won’t Turn On Or Boot Up

There are lots of reasons why you might find that your Mac won’t turn on, or your MacBook won’t start up, but you probably just want to get it working again. We’ll run through the various checks and changes to make to get your Mac to boot up and start working again.

Read on for some simple tips that should get your Mac working again, from the obvious stuff like checking the power connection to performing a power cycle, starting in Recovery mode, and checking the file system. And if your Mac really is dead, we’ll also tell you where to turn next.

The fixes in this article apply to most recent versions of macOS. The menus and interfaces may look slightly different depending on which OS you are running, but their functions are in essence the same.

1. Check your Mac turns on

First, let’s find out if the problem is that your Mac won’t start up, or that it won’t turn on – those might sound like the same thing, but there’s actually a big difference.

Press the Power button on your Mac. If you don’t hear a startup chime, you don’t hear any fan or drive noise, and there are no images, video, or visuals of any sort on your display, then your Mac isn’t turning on at all. You’re not even getting to the point where it refuses to start up.

A Mac that doesn’t turn on calls for a different approach to one that doesn’t start up. If your computer doesn’t turn on then you need to do the following:

Check your power connection

Don’t be the cliché: check that the power is on and the Mac is plugged in correctly. Or if it’s a laptop, be sure that the battery isn’t dead – and if it needs charging, give it a while to attempt to charge before concluding that it isn’t going to work. If your MacBook won’t charge read this.

Try a different power cable or adapter

It may be that the fault resides with the power cable. If you’ve got a friend with a Mac power cable that fits your machine, try it to see if that solves the problem. If it does, it could be a simple fix that involves finding a secondhand power cable on eBay (although we advise against buying third-party power cables that aren’t made by Apple, as they are much more likely to be faulty and possibly dangerous).

If you recently had a power cut, that could be responsible: your power adaptor could have been damaged in a power surge and you may need a new one.

Finally, it’s possible that the cable is loose, and pulling it out and plugging it in again will solve the problem. But we doubt it will be that easy.

Disconnect all accessories

Unplug all the accessories (such as printers and USB hubs) attached to your Mac. It could be that one of your peripherals is causing problems with the startup sequence.

If you recently installed new RAM or a new hard drive, make sure they are correctly installed and compatible. (If possible, reinstall the old memory or hard drive and see if that helps.)

If none of those steps work then it’s time to move onto the next stage.

2. Perform a Power Cycle

If you aren’t hearing any signs of life, you could perform a power cycle, which involves forcing your Mac to restart after killing the power to it.

On a MacBook you need to hold down the power key for ten seconds. You’ll usually hear a squeak as the Mac’s power is forcibly cut.

Hopefully after waiting ten seconds and restarting, all will be well.

If your Mac is a desktop you will need to unplug it and leave it unpluggged for at least ten seconds before plugging it back in and attempting to restart.

3. Check your display

If you’re using a desktop Mac such as a Mac Pro or Mac mini this could apply to you. If you don’t have a separate display plugged in you can skip this step.

You could have a problem with the display you have plugged in, rather than the Mac itself. Have a listen to your Mac to see if it’s making any sounds during bootup.

It is possible that your Mac does turn on, but doesn’t boot up because it can’t access the display – if that’s the case you are most likely having trouble with the display hardware (rather than a broader startup issue).

If you think it’s a problem with your monitor, then take a look at this Apple Support document for advice on troubleshooting a display. If your display isn’t working the advice is to:

  1. Check the power supply to the Mac (and the power to the display if using a separate unit).
  2. Confirm that all cables are connected securely.
  3. Remove all display extenders and switches, and any other devices between the Mac and monitor.
  4. Unplug the video cable (if using a separate monitor) and plug it back in.
  5. If using more than one monitor in a ‘daisy chain’, unplug all monitors and test using just one.
  6. If possible, try to use a different display, or a different adapter (use DVI instead of VGA, for example).
  7. Apple also advises adjusting the screen resolution in System Preferences.

4. Boot up your Mac in Safe Boot

Safe Boot limits what checks and functionality your Mac focuses on during startup, and performs certain diagnostics. It’s rare, but sometimes you can get your unhappy Mac to start up successfully with a Safe Boot, and then restart it normally, and everything returns to hunky-doriness.

To enter Safe Mode: Shut the Mac down and start it up while holding down the Shift key. Safe Boot can take a while to start (if it does work at all).

To get some feedback about what’s happening, you might choose to start up while holding down Shift, Command and V: that enters both Safe Boot and something called Verbose Mode, which spits out some messages about what Safe Boot is actually trying to do as it goes.

If you want more help with this step read: How to start a Mac in Safe Mode.

While you are Safe Mode the interface will look very slightly different, with blocks of colour rather than transparancy. The biggest giveaway is the Dock at the bottom of the screen, such as in the image below, for example.

Once in Safe Mode you may be able to run certain checks (described below) and make changes that could fix your Mac.

5. Check the file system

This step is actually kind of fun – at least when it’s not your Mac that’s under the weather. It’s fun because it feels so geeky.

  1. Shut the Mac off, and start it up again while holding Cmd + S to launch in Single User Mode. You can release the keys when the intimidating black screen with messages in white text appears.
  2. Wait until the command-line prompt appears, when all the text is done scrolling past. Then type fsck -fy and hit Return. And wait. Possibly for several long minutes.
  3. Eventually, after five different checks that take varying amounts of time, you should get to one of two messages: “The volume [your Mac’s name] appears to be OK” or “FILE SYSTEM WAS MODIFIED.”
  4. If you encounter the first message, type reboot and press Return.
  5. If you see the latter message, you need to run fsck -fy all over again. You can retype the command and hit Return, or press the Up arrow once and then press Return.

If this doesn’t work, and your Mac still doesn’t start up, then move on to the next step.

6. Reset the PRAM / NVRAM

In the PowerPC days, we talked about resetting the PRAM. On modern Macs, the real term is resetting the NVRAM. The name refers to special memory sections on your Mac that store data that persists even when the Mac is shut off, such as volume settings and screen resolution.

Resetting that data isn’t harmful, but quite frankly it’s also rarely genuinely useful. But it can’t hurt.

You might need to grow an extra finger or two for this one, or have a friend help you out. Here’s how to reset the PRAM/NVRAM on your Mac:

  1. Hold down all of these keys: Command, Option (Alt), P and R, and turn on the Mac (it’s the same keys to reset the PRAM).
  2. Keep holding the keys down until you hear the Mac restart again.
  3. Listen for a second reboot, and then release the keys.

In some cases, after performing this step, your Mac will restart normally. In other cases, you might instead see a progress bar on startup. If the progress bar fills up and then the Mac starts up, you’re probably good to go. In some cases we’ve seen, however, the Mac shuts down at around the halfway point in the progress bar.

7. Reset the SMC

In some situations, you may need to reset your Mac’s SMC (System Management Controller). This is largely a last-ditch attempt to fix the current version of macOS before attempting to recover the data and moving on to reinstalling the OS.

Here’s what to do if you want to reset the SMC:

On a Mac laptop:

  1. Shut down the MacBook.
  2. Unplug and then reconnect the power cable.
  3. Press Shift + Ctrl + Option/Alt keys and the power button at the same time.
  4. Now release all those keys and the power button at the same time.
  5. You may see the light on the power cable flicker.
  6. Restart your MacBook.

On a Mac desktop:

  1. Shut down the Mac.
  2. Unplug it.
  3. Press the power button for 5 seconds.
  4. Plug the Mac back in.
  5. Turn on your Mac.

8. Run Disk Utility in Recovery Mode

If your Mac is booting but the operating system isn’t loading up, you may have a corrupted drive. Luckily it is possible to fix this in Recovery Mode. We have a detailed tutorial on using Recovery Mode here, but we’ll run thorough the basics below.

The first step is to run Disk Utility. On a Mac running Mountain Lion or later, which will be the vast majority of Macs, you can run Disk Utility by booting into Recovery Mode, here’s how:

  1. Make sure the Mac is turned off. If it’s not responsive because it’s stuck on a grey, blue or white screen, just hold down the Mac’s power button for several seconds until it gives up and shuts off. (Here’s what to do to fix a Blue Screen of Death on a Mac.)
  2. Hold down the Command and R keys, and power the Mac back up again. Keep pressing Cmd + R while your Mac is booting up until you see the Apple logo.
  3. Once your Mac starts in Recovery Mode you will gain access to Utilities. Click on the Disk Utility option.
  4. Locate your Mac’s drive – probably Macintosh HD, select it.
  5. Click First Aid.
  6. If there are errors with your disk, Disk Utility should find them and will either repair them automatically, or will ask if you would like to repair them. Click Repair Disk if this is the case.

In Recovery Mode you can also do the following:

9. Use Target disk mode to copy files

This step should be taken prior to reinstalling macOS and it depends on your backup situation. You do make regular backups, or at least sync important documents, music and photos to the cloud, right?

If you’re not sweating at the moment, and are confident in your Time Machine or other backup solution, then skip to Step 10 below. But if you wish you’d backed up your Mac then now is the time to see what you can salvage from the machine.

For this, you’ll need a second Mac. If you haven’t got one then ask a friend. Follow these steps to use Target Disk Mode:

  1. Connect both Macs together using an Apple Thunderbolt cable (£39 from Apple). If you have an older Mac this same process works with FireWire cables.
  2. Switch off your Mac.
  3. Start up your Mac while holding down the T button on the keyboard.
  4. Keep holding the T button down as you hear the startup chime and keep it pressed until the Thunderbolt icon appears on your screen.

This places your Mac in Target disk mode. In Target Disk mode your Mac acts like an external drive. You should now hopefully see the hard drive for your faulty Mac on your second Mac’s Finder.

You should be able to grab the files you need from your hard drive, or even clone the entire hard drive to another external drive.

10. Reinstall macOS

This is pretty drastic, but if you have tried everything else, then reinstalling the operating system could remove the issue that is stopping the Mac from starting properly.

Remember macOS Recovery from the step above? You can use it to reinstall macOS too.

  1. Boot into Recovery mode as above (hold the Command and R keys while you start up).
  2. Once in Recovery click to install the latest OS and follow the onscreen prompts.

Our article on resetting a Mac to factory settings has more information on wiping a Mac and reinstalling macOS.

We have this tutorial on how to defrag a Mac (and why it’s not necessary).

11. Make a Genius Bar appointment

If you’ve made it this far and your Mac still doesn’t work, you’ll need to take it to an Apple Genius Bar to see if they can help you fix it (or arrange for a repair under warranty). Hopefully you have got enough data from your Mac so as to be able to back up, or continue working on a new Mac.

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